Research On Controller Of Vertical Axis Wind Turbine

As the problems of the world energy and pollution become more and more serious, it is unprecedented concerned for wind energy which is one of the green energy. Because the characteristic of wind is random and uncertainty, the utilization of wind energy is not ideal. Compared the Horizontal axis wind turbine and Vertical axis wind turbine(VAWT) , VAWT has its superiority. It is convenient and simple to debug and assemble. It does not need yaw mechanism. Therefore, VAWT gradually becomes the first choice of small-scale wind turbines. VAWT has wide applications and prospects.At first, the article presents a view on the development of wind turbine at home and abroad. It describes the VAWT's components and the tracking of the wind. In order to get the maximum power from wind, the theory of maximum power point tracking(MPPT) is introduced. The models of Wind turbine, permanent magnet synchronous generator and battery are built on Matlab/Simulink. Compile the S-function as system's controller which realizes the function of MPPT. The results of simulation confirm the feasibility of MPPT. In the hardware, filter circuit is designed in order to avoid the interference on sampling signal of voltage and current. To prevent the MOSFET damaged by the heating, MOSFETs in parallel is used. To reduce the possibility of hardware damage, the software protections are designed. It includes the over rotate speed protection and over power protection. In order to prevent the output current abnormal, PI controller is used for the stability of output current.Finally, this article uses the theory of power factor correction. The power factor after rectifier is low. The same power of generator results in large capacity and the poor operating ratio. Then it is necessary to use the power factor correction in three-phase generator output voltage. Corrected output of three-phase power factor is greatly improved, which reduces motor capacity and lowers the cost of the system.